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        <h1 class="page_title">chrome.contentSettings</h1>
        
        
        
        <div id="toc">
          <h2>Contents</h2>
          <ol>
            <li>
              <a href=#manifest>Manifest</a>
            </li>
            <li>
              <a href=#patterns>Content setting patterns</a>
              <ol>
                <li><a href=#pattern-precedence>Pattern precedence</a></li>
              </ol>
            </li>
            <li>
              <a href=#primary-secondary>Primary and secondary patterns</a>
            </li>
            <li>
              <a href=#resource-identifiers>Resource identifiers</a>
            </li>
            <li>
              <a href=#examples>Examples</a>
            </li>
            <li>
              <a href="#apiReference">API reference: chrome.contentSettings</a>
              <ol>
                  <li><a href="#types">Types</a><ol>  <li>    <a href="#type-ResourceIdentifier">ResourceIdentifier</a>  </li>  <li>    <a href="#type-ContentSetting">ContentSetting</a><ol><li>      <a href="#ContentSetting-methods">Methods</a>      <ol>        <li><a href="#method-ContentSetting-clear">clear</a></li>        <li><a href="#method-ContentSetting-get">get</a></li>        <li><a href="#method-ContentSetting-set">set</a></li>        <li><a href="#method-ContentSetting-getResourceIdentifiers">getResourceIdentifiers</a></li>      </ol>    </li></ol>  </li></ol></li>
                  <li><a href="#properties">Properties</a><ol>  <li>    <a href="#property-cookies">cookies</a>  </li>  <li>    <a href="#property-images">images</a>  </li>  <li>    <a href="#property-javascript">javascript</a>  </li>  <li>    <a href="#property-plugins">plugins</a>  </li>  <li>    <a href="#property-popups">popups</a>  </li>  <li>    <a href="#property-notifications">notifications</a>  </li></ol></li>
                  
                  
                  <li><a href="#samples">Sample Extensions</a></li>
              </ol>
            </li>
          </ol>
        </div>

<p>
The content settings module allows you to change settings that control whether
websites can use features such as cookies, JavaScript, and plug-ins.
More generally speaking, content settings allow you to customize Chrome's
behavior on a per-site basis instead of globally.</p>
<p>
</p>

<h2 id="manifest">Manifest</h2>
<p>You must declare the "contentSettings" permission
in your extension's manifest to use the API.
For example:</p>
<pre>{
  "name": "My extension",
  ...
  <b>"permissions": [
    "contentSettings"
  ]</b>,
  ...
}</pre>


<h2 id="patterns">Content setting patterns</h2>
<p>
You can use patterns to specify the websites that each content setting affects.
For example, <code>http://*.youtube.com/*</code> specifies youtube.com and all
of its subdomains. The syntax for content setting patterns is the same as for
<a href="match_patterns.html">match patterns</a>, with a few differences:
<ul><li>For <code>http</code>,
<code>https</code>, and <code>ftp</code> URLs, the path must be a wildcard
(<code>/*</code>). For <code>file</code> URLs, the path must be completely
specified and <strong>must not</strong> contain wildcards.</li>
<li>In contrast to match patterns, content setting patterns can specify a port
number. If a port number is specified, the pattern only matches websites with
that port. If no port number is specified, the pattern matches all ports.
</li>
</ul>
</p>

<h3 id="pattern-precedence">Pattern precedence</h3>
<p>
When more than one content setting rule applies for a given site, the rule with
the more specific pattern takes precedence.
</p>
<p>For example, the following patterns are ordered by precedence:</p>
<ol>
<li><code>http://www.example.com/*</code></li>
<li><code>http://*.example.com/*</code> (matching
example.com and all subdomains)</li>
<li><code>&lt;all_urls&gt;</code> (matching every URL)</li>
</ol>
<p>
Three kinds of wildcards affect how specific a pattern is:
</p>
<ul>
<li>Wildcards in the port (for example
<code>http://www.example.com:*/*</code>)</li>
<li>Wildcards in the scheme (for example
<code>*://www.example.com:123/*</code>)</li>
<li>Wildcards in the hostname (for example
<code>http://*.example.com:123/*</code>)</li>
</ul>
<p>
If a pattern is more specific than another pattern in one part but less specific
in another part, the different parts are checked in the following order:
hostname, scheme, port. For example, the following patterns are ordered by
precedence:</p>
<ol>
<li><code>http://www.example.com:*/*</code><br>
Specifies the hostname and scheme.</li>
<li><code>*:/www.example.com:123/*</code><br>
Not as high, because although it specifies the hostname, it doesn't specify
the scheme.</li>
<li><code>http://*.example.com:123/*</code><br>
Lower because although it specifies the port and scheme, it has a wildcard
in the hostname.</li>
</ol>

<h2 id="primary-secondary">Primary and secondary patterns</h2>
<p>
The URL taken into account when deciding which content setting to apply depends
on the content type. For example, for
<a href="#property-notifications">notifications</a> settings are
based on the URL shown in the omnibox. This URL is called the "primary" URL.</p>
<p>
Some content types can take additional URLs into account. For example,
whether a site is allowed to set a
<a href="#property-cookies">cookie</a> is decided based on the URL
of the HTTP request (which is the primary URL in this case) as well as the URL
shown in the omnibox (which is called the "secondary" URL).
</p>
<p>
If multiple rules have primary and secondary patterns, the rule with the more
specific primary pattern takes precedence. If there multiple rules have the same
primary pattern, the rule with the more specific secondary pattern takes
precedence. For example, the following list of primary/secondary pattern pairs
is ordered by precedence:</p>
<table>
<tr><th>Precedence</th><th>Primary pattern</th><th>Secondary pattern</th>
<tr>
  <td>1</td>
  <td><code>http://www.moose.com/*</code>, </td>
  <td><code>http://www.wombat.com/*</code></td>
</tr><tr>
  <td>2</td>
  <td><code>http://www.moose.com/*</code>, </td>
  <td><code>&lt;all_urls&gt;</code></td>
</tr><tr>
  <td>3</td>
  <td><code>&lt;all_urls&gt;</code>, </td>
  <td><code>http://www.wombat.com/*</code></td>
</tr><tr>
  <td>4</td>
  <td><code>&lt;all_urls&gt;</code>, </td>
  <td><code>&lt;all_urls&gt;</code></td>
</tr>
</table>

<h2 id="resource-identifiers">Resource identifiers</h2>
<p>
Resource identifiers allow you to specify content settings for specific
subtypes of a content type. Currently, the only content type that supports
resource identifiers is <a href="#property-plugins"><code>plugins</code></a>,
where a resource identifier identifies a specific plug-in. When applying content
settings, first the settings for the specific plug-in are checked. If there are
no settings found for the specific plug-in, the general content settings for
plug-ins are checked.
</p>
<p>
For example, if a content setting rule has the resource identifier
<code>adobe-flash-player</code> and the pattern <code>&lt;all_urls&gt;</code>,
it takes precedence over a rule without a resource identifier and the pattern
<code>http://www.example.com/*</code>, even if that pattern is more specific.
</p>
<p>
You can get a list of resource identifiers for a content type by calling the
<a href="contentSettings.html#method-ContentSetting-getResourceIdentifiers">
<code>getResourceIdentifiers()</code></a> method. The returned list
can change with the set of installed plug-ins on the user's machine, but Chrome
tries to keep the identifiers stable across plug-in updates.
</p>

<h2 id="examples">Examples</h2>

<p>
You can find samples of this API on the
<a href="samples.html#contentSettings">sample page</a>.
</p>
        <h2 id="apiReference">API Reference: chrome.contentSettings</h2>
        <div class="api_reference">
            <h3 id="types">Types</h3>
              <div>
                <h3 id="type-ResourceIdentifier">ResourceIdentifier</h3>
                <div>
                  <dt><span class="type_name">  (    <span id="typeTemplate">object</span>  )</span></dt>
              <dd>
                    The only content type using resource identifiers is <a href="contentSettings.html#property-plugins"><var>plugins</var></a>. For more information, see <a href="contentSettings.html#resource-identifiers">Resource Identifiers</a>.
                  </dd>    <h4 id="ResourceIdentifier-properties">
                    Properties of <a href="#type-ResourceIdentifier">ResourceIdentifier</a>
                  </h4>
                  <dd><dl>      <div>
                      <a name="property-ResourceIdentifier-id"></a>
                      <dt>
                        <span class="variable">id</span>
                        <span class="property">
                          (
                            
                            <span id="typeTemplate">string</span>
                          )
                        </span>
                      </dt>
                      <dd>
                        The resource identifier for the given content type.
                      </dd>
                    </div>
                    <div>
                      <a name="property-ResourceIdentifier-description"></a>
                      <dt>
                        <span class="variable">description</span>
                        <span class="property">
                          (
                            <span class="optional">optional</span>
                            <span id="typeTemplate">string</span>
                          )
                        </span>
                      </dt>
                      <dd>
                        A human readable description of the resource.
                      </dd>
                    </div>
              </dl></dd>
                </div>
              </div>
              <div>
                <h3 id="type-ContentSetting">ContentSetting</h3>
                <div>
                  <dt><span class="type_name">  (    <span id="typeTemplate">object</span>  )</span></dt>
                  <h4 id="ContentSetting-methods">
                    Methods of <a href="#type-ContentSetting">ContentSetting</a>
                  </h4>
                  <dd><dl>      <div>
                      <h4 id="method-ContentSetting-clear">clear</h4>
                      <div class="summary lower">
                        <span>ContentSetting.clear</span>(<span>object <span class="variable">details</span></span>)
                      </div>
                      <div class="description">
                    <p>
                          Clear all content setting rules set by this extension.
                        </p>    <h4>Parameters</h4>
                        <dl>
                          <div>  <a name="property-clear-details"></a>  <dt>    <span class="variable">details</span>    <span class="property">      (                <span id="typeTemplate">object</span>      )    </span>  </dt>  <dd>    <dl>      <div>        <a name="property-details-scope"></a>        <dt>          <span class="variable">scope</span>          <span class="property">            (              <span class="optional">optional</span>              <span id="typeTemplate">enumerated string ["regular", "incognito_session_only"]</span>            )          </span>        </dt>        <dd>          Where to set the setting (default: regular). One of<br><var>regular</var>: setting for regular profile (which is inherited by the incognito profile if not overridden elsewhere),<br><var>incognito_session_only</var>: setting for incognito profile that can only be set during an incognito session and is deleted when the incognito session ends (overrides regular settings).        </dd>      </div>    </dl>  </dd></div>
                        </dl>
                        <h4>Callback function</h4><p>      If you specify the <em>callback</em> parameter, it should      specify a function that looks like this:</p><pre>function() <span class="subdued">{...}</span>;</pre><dl>  </dl>
                      </div>
                    </div>
                    <div>
                      <h4 id="method-ContentSetting-get">get</h4>
                      <div class="summary lower">
                        <span>ContentSetting.get</span>(<span>object <span class="variable">details</span></span>)
                      </div>
                      <div class="description">
                    <p>
                          Gets the current content setting for a given pair of URLs.
                        </p>    <h4>Parameters</h4>
                        <dl>
                          <div>  <a name="property-get-details"></a>  <dt>    <span class="variable">details</span>    <span class="property">      (                <span id="typeTemplate">object</span>      )    </span>  </dt>  <dd>    <dl>      <div>        <a name="property-details-primaryUrl"></a>        <dt>          <span class="variable">primaryUrl</span>          <span class="property">            (                            <span id="typeTemplate">string</span>            )          </span>        </dt>        <dd>          The primary URL for which the content setting should be retrieved. Note that the meaning of a primary URL depends on the content type.        </dd>      </div>      <div>        <a name="property-details-secondaryUrl"></a>        <dt>          <span class="variable">secondaryUrl</span>          <span class="property">            (              <span class="optional">optional</span>              <span id="typeTemplate">string</span>            )          </span>        </dt>        <dd>          The secondary URL for which the content setting should be retrieved. Defaults to the primary URL. Note that the meaning of a secondary URL depends on the content type, and not all content types use secondary URLs.        </dd>      </div>      <div>        <a name="property-details-resourceIdentifier"></a>        <dt>          <span class="variable">resourceIdentifier</span>          <span class="property">            (              <span class="optional">optional</span>              <span id="typeTemplate"><a href="contentSettings.html#type-ResourceIdentifier">ResourceIdentifier</a></span>            )          </span>        </dt>        <dd>          A more specific identifier of the type of content for which the settings should be retrieved.        </dd>      </div>      <div>        <a name="property-details-incognito"></a>        <dt>          <span class="variable">incognito</span>          <span class="property">            (              <span class="optional">optional</span>              <span id="typeTemplate">boolean</span>            )          </span>        </dt>        <dd>          Whether to check the content settings for an incognito session. (default false)        </dd>      </div>    </dl>  </dd></div>
                        </dl>
                        <h4>Callback function</h4><p>      The <em>callback</em> parameter should specify a function      that looks like this:</p><pre>function(object details) <span class="subdued">{...}</span>;</pre><dl>  <div>  <a name="property-callback-details"></a>  <dt>    <span class="variable">details</span>    <span class="property">      (                <span id="typeTemplate">object</span>      )    </span>  </dt>  <dd>    <dl>      <div>        <a name="property-details-setting"></a>        <dt>          <span class="variable">setting</span>          <span class="property">            (                            <span id="typeTemplate">any</span>            )          </span>        </dt>        <dd>          The content setting. See the description of the individual ContentSetting objects for the possible values.        </dd>      </div>    </dl>  </dd></div></dl>
                      </div>
                    </div>
                    <div>
                      <h4 id="method-ContentSetting-set">set</h4>
                      <div class="summary lower">
                        <span>ContentSetting.set</span>(<span>object <span class="variable">details</span></span>)
                      </div>
                      <div class="description">
                    <p>
                          Applies a new content setting rule.
                        </p>    <h4>Parameters</h4>
                        <dl>
                          <div>  <a name="property-set-details"></a>  <dt>    <span class="variable">details</span>    <span class="property">      (                <span id="typeTemplate">object</span>      )    </span>  </dt>  <dd>    <dl>      <div>        <a name="property-details-primaryPattern"></a>        <dt>          <span class="variable">primaryPattern</span>          <span class="property">            (                            <span id="typeTemplate">string</span>            )          </span>        </dt>        <dd>          The pattern for the primary URL. For details on the format of a pattern, see <a href='contentSettings.html#patterns'>Content Setting Patterns</a>.        </dd>      </div>      <div>        <a name="property-details-secondaryPattern"></a>        <dt>          <span class="variable">secondaryPattern</span>          <span class="property">            (              <span class="optional">optional</span>              <span id="typeTemplate">string</span>            )          </span>        </dt>        <dd>          The pattern for the secondary URL. Defaults to matching all URLs. For details on the format of a pattern, see <a href='contentSettings.html#patterns'>Content Setting Patterns</a>.        </dd>      </div>      <div>        <a name="property-details-resourceIdentifier"></a>        <dt>          <span class="variable">resourceIdentifier</span>          <span class="property">            (              <span class="optional">optional</span>              <span id="typeTemplate"><a href="contentSettings.html#type-ResourceIdentifier">ResourceIdentifier</a></span>            )          </span>        </dt>        <dd>          The resource identifier for the content type.        </dd>      </div>      <div>        <a name="property-details-setting"></a>        <dt>          <span class="variable">setting</span>          <span class="property">            (                            <span id="typeTemplate">any</span>            )          </span>        </dt>        <dd>          The setting applied by this rule. See the description of the individual ContentSetting objects for the possible values.        </dd>      </div>      <div>        <a name="property-details-scope"></a>        <dt>          <span class="variable">scope</span>          <span class="property">            (              <span class="optional">optional</span>              <span id="typeTemplate">enumerated string ["regular", "incognito_session_only"]</span>            )          </span>        </dt>        <dd>          Where to clear the setting (default: regular). One of<br><var>regular</var>: setting for regular profile (which is inherited by the incognito profile if not overridden elsewhere),<br><var>incognito_session_only</var>: setting for incognito profile that can only be set during an incognito session and is deleted when the incognito session ends (overrides regular settings).        </dd>      </div>    </dl>  </dd></div>
                        </dl>
                        <h4>Callback function</h4><p>      If you specify the <em>callback</em> parameter, it should      specify a function that looks like this:</p><pre>function() <span class="subdued">{...}</span>;</pre><dl>  </dl>
                      </div>
                    </div>
                    <div>
                      <h4 id="method-ContentSetting-getResourceIdentifiers">getResourceIdentifiers</h4>
                      <div class="summary lower">
                        <span>ContentSetting.getResourceIdentifiers</span>()
                      </div>
                      <div class="description">
                    <p>
                          
                        </p>  </div>
                    </div>
              </dl></dd>
                </div>
              </div>
            <h3 id="properties">Properties</h3>
              <div>
                <h3 id="property-cookies">cookies</h3>
                <div class="summary">
                  <span>chrome.contentSettings.cookies</span>
                </div>
                <div>
                  <dt><span class="property">cookies</span> <span class="type_name">  (    <span id="typeTemplate"><a href="contentSettings.html#type-ContentSetting">ContentSetting</a></span>  )</span></dt>
              <dd>
                    Whether to allow cookies and other local data to be set by websites. One of<br><var>allow</var>: Accept cookies,<br><var>block</var>: Block cookies,<br><var>session_only</var>: Accept cookies only for the current session. <br>Default is <var>allow</var>.<br>The primary URL is the URL representing the cookie origin. The secondary URL is the URL of the top-level frame.
                  </dd>  </div>
              </div>
              <div>
                <h3 id="property-images">images</h3>
                <div class="summary">
                  <span>chrome.contentSettings.images</span>
                </div>
                <div>
                  <dt><span class="property">images</span> <span class="type_name">  (    <span id="typeTemplate"><a href="contentSettings.html#type-ContentSetting">ContentSetting</a></span>  )</span></dt>
              <dd>
                    Whether to show images. One of<br><var>allow</var>: Show images,<br><var>block</var>: Don't show images. <br>Default is <var>allow</var>.<br>The primary URL is the main-frame URL. The secondary URL is the URL of the image.
                  </dd>  </div>
              </div>
              <div>
                <h3 id="property-javascript">javascript</h3>
                <div class="summary">
                  <span>chrome.contentSettings.javascript</span>
                </div>
                <div>
                  <dt><span class="property">javascript</span> <span class="type_name">  (    <span id="typeTemplate"><a href="contentSettings.html#type-ContentSetting">ContentSetting</a></span>  )</span></dt>
              <dd>
                    Whether to run JavaScript. One of<br><var>allow</var>: Run JavaScript,<br><var>block</var>: Don't run JavaScript. <br>Default is <var>allow</var>.<br>The primary URL is the main-frame URL. The secondary URL is not used.
                  </dd>  </div>
              </div>
              <div>
                <h3 id="property-plugins">plugins</h3>
                <div class="summary">
                  <span>chrome.contentSettings.plugins</span>
                </div>
                <div>
                  <dt><span class="property">plugins</span> <span class="type_name">  (    <span id="typeTemplate"><a href="contentSettings.html#type-ContentSetting">ContentSetting</a></span>  )</span></dt>
              <dd>
                    Whether to run plug-ins. One of<br><var>allow</var>: Run plug-ins automatically,<br><var>block</var>: Don't run plug-ins automatically. <br>Default is <var>allow</var>.<br>The primary URL is the main-frame URL. The secondary URL is not used.
                  </dd>  </div>
              </div>
              <div>
                <h3 id="property-popups">popups</h3>
                <div class="summary">
                  <span>chrome.contentSettings.popups</span>
                </div>
                <div>
                  <dt><span class="property">popups</span> <span class="type_name">  (    <span id="typeTemplate"><a href="contentSettings.html#type-ContentSetting">ContentSetting</a></span>  )</span></dt>
              <dd>
                    Whether to allow sites to show pop-ups. One of<br><var>allow</var>: Allow sites to show pop-ups,<br><var>block</var>: Don't allow sites to show pop-ups. <br>Default is <var>block</var>.<br>The primary URL is the main-frame URL. The secondary URL is not used.
                  </dd>  </div>
              </div>
              <div>
                <h3 id="property-notifications">notifications</h3>
                <div class="summary">
                  <span>chrome.contentSettings.notifications</span>
                </div>
                <div>
                  <dt><span class="property">notifications</span> <span class="type_name">  (    <span id="typeTemplate"><a href="contentSettings.html#type-ContentSetting">ContentSetting</a></span>  )</span></dt>
              <dd>
                    Whether to allow sites to show desktop notifications. One of<br><var>allow</var>: Allow sites to show desktop notifications,<br><var>block</var>: Don't allow sites to show desktop notifications,<br><var>ask</var>: Ask when a site wants to show desktop notifications. <br>Default is <var>ask</var>.<br>The primary URL is the main-frame URL. The secondary URL is not used.
                  </dd>  </div>
              </div>
        </div>
          <h2 id="samples">Sample Extensions that use chrome.contentSettings</h2>
            <li><strong><a href="samples.html#fca4e590e0afe37428e5724d34f3a5b3">Per-plugin content settings</a></strong> &ndash;
            Customize your content setting for different plug-ins.
        </li>
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